[Qgis-user] length...

Micha Silver micha at arava.co.il
Fri Mar 13 05:05:14 EDT 2009

Carson Farmer wrote:

> T,
> To get the column length, you can use the export/add geometry function 
> in fTools, which will create a copy of the dataset (as a shapefile) 
> with an additional length field (or it will populated the length field 
> if it already exists). From this you can use the compute basic 
> statistics function to get the sum of the field...
Any chance to alter the fTools plugin so that the geometry functions 
stick the new columns straight into the original shapefile? I can't 
think of any situation where you'd need to keep both the original shape 
without the geometry attribute and the new one with. 
Other GIS software (i.e. GRASS as John Tull pointed out, as well as 
Arc*) just add the length/perimeter, X-Y  or area column into the 
existing vector layer.

A minor annoyance, but it would be nice...
> Hopefully that's what you are looking for?
> Carson
>> HI everybody
>> i hope someone can help me with this:
>> in a poly-line vector layer, which is obviously built of several 
>> festures, how can i add a column of LENGTH to the attribute table? 
>> then how can i SUM all of it?
>> T
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